Warp stop-motion for looms



(No Model.)

J. 11. NORTHROP. WARP STOP MOTIGN FOR LOOMS.

Patented Sept. 21, 1897 c L76016 .175 Jirfitrop.

UNITED STATES PATENT OFFI E.

JAMES H. NORTI-IROP, OF IIOPEDALE, MASSACHUSETTS, ASSIGNOR TO THE DRAPER COMPANY, OF SAME PLACE AND PORTLAND, MAINE.

WARP STOP-MOTION FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 590,551, dated September 21, 1897.

Application filed May 22, 1897. Serial No. 687,6 '70. (No model.)

To all whom it may concern: plan view of the protector mechanism. Fig. Be it known that I, JAMES H. NORTHROP, of 3 is a rear elevation thereof, looking to the llopedale, county of Worcester, State of Masleft, Fig. 1, and also enlarged. Fig. at is an sachusetts, have invented an Improvement in enlarged side elevation of the protector mech- 5 IVarp Stop-Motions for Looms, of which the anism engaging a dropped detector when 55 following description, in connection with the moving in one direction. Fig. 5 is a like accompanying drawings, is a specification, view, but moving in the opposite direction like letters and figures on the drawings repreand also engaging a dropped detector; and

senting like parts. Fig. '6 is a partial longitudinal section taken This invention relates more particularly to on the line a: 00, Fig. 1. I p 6o warp-stop-motionmechanism forloomswhere- In Fig. l the front and back banks of dein failure of the warp-threads acts through tectors cl and d, which also serve herein as suitable stop-motion-actuating detectors to heddles and are preferably made as flat thin stop the loom. The detectors, which may metal strips, each having a warp-eye 2, are

also serve as heddles, as hereinafter shown, arranged in double series and slotted at their are preferably flat metallic strips having each upper ends to receive cross'bars a a, forma warp-receiving eye, a dropped detector being parts of vertically-reciprocated frames ing engaged by and stopping the normal move? a a' ment of a vibrator, such stoppage, through The frames are connected by suitable flexi- 2o suitable mechanism, eifecting automatically ble overhead connections a while at their the stopping of the loom. In such apparatus lower ends the framesare connected to usual it is usually necessary to adjust the parts with cam-actuated treadles (not shown) by straps considerable accuracy in order to prevent a a bending or breakage of a dropped detector by- A separator 1), extended across the loom,

25 the vibrator, and sometimes owing to careseparates the lower ends of the two sets of lessness or ignorance on the part of the atdetectors (1 d and also serves as a back-stop tendant accidents will occur even with a rea-' or support for a dropped detector when ensonably accurate adjustment. gaged by the vibrator, the lower edge of the My. present invention has for its object the separator having preferably a serrated or 0 production of vibrator-actuating.mechanism milled foot b to prevent twisting of an enso constructed that breakage or injury to a gaged detector.

detector is absolutely prevented, the actu- Below the separatorarock-shaft f is mountating mechanism being provided with a pro ed in suit-able bearings and extended across tective device which renders its operation the loom said rock-shaft having fast thereon entirely independent of the attendant. The yoke-like arms f, to which'are secured viactuating mechanism may be operated by or brators 'u c to engage a dropped detector (1 through the peculiar cam and stopping mech or d, respectively. It will be understood anism shown in another application, Serial that the detectors have a vertical movement No. 627,545, filed by me March 15, 1897, or independent of theirsupporting-bars a a 40 any suitable cam of usual construction may and that when the warp-threads are intact or 0 be used to operate the actuating mechanism, properly taut their detectors will beheld with and any suitable stopping mechanism for the their lower ends above the path of movement loom may be used in connection therewith, the of the cooperating vibrator, as in United stopping mechanism being rendered opera- States Patent to Roper, No. 536,969, to which 5 tive upon stoppage of the vibrator by engagereference may be had. Now if the mechan- 5 ment with a dropped detector. ism for actuating the vibrator is not properly Figure l is apartial longitudinal sectional adjusted engagement with a dropped deview of a sufficient portion of a loom to be tector would result in injury to the detector understood with my invention applied thereor to the cooperating mechanism, and to pre- 50 to. Fig. 2, on an enlarged scale, is a top or vent such contingency the vibrator-actuat- I00 ing mechanism includes protective devices, whereby injury of the parts cannot occur even if the adjustment is not exact.

' The rock-shaftf has rigidly secured thereon a split collar f adjustably held in place by a set-screw f the collar having a radially-extended arm f having a laterally-offset earf parallel to the length of the rock-shaft.

Two hubs h and 7c are mounted loosely on the rock-shaft end to end between the collar f and a loose sleeve f, the latter being held from longitudinal movement by a collar f fast on the shaft.

Radial arms 71 7t" on the hubs are oppositely extended in parallelism at their outer ends at 7L2 70 Fig. 2, to receive between them the ear f ,which,it will be remembered,moves with the rock-shaft, the arms h 70 being drawn toward each other by a spring S, secured to oppositely-projecting extensions 71 kof the arms.

The loose sleeve f is provided with a segmental arm f radially slotted at f and provided with an inturned ear f which projects between the bent ends 7L2 70 as clearly shown in Figs. 2 and 3, the said armand ear serving as an actuator for the rock-shaft.

Any suitable cam, as C, Fig. 1, reciprocates a link 0 provided with a stud c to enter the slot f of the actuator-arm f thereby rocking the sleeve f and its arm and normally rocking the shaft f through the arms h k, the spring Sv being strong enough to draw the arms together against the ears f and f when the loom is running properly, so that they move as one piece.

Referring now to Fig. 4, the link 0 moving in the direction of arrow 10, suppose a detector (1' has dropped, by breakage or undue slackness of its warp-thread, to be engaged by its cooperating vibrator r, stopping its movement as well as that of the rock-shaft f. As the link completes its throw the ear f will swing the arm k with it, but the ear f fast on the rock-shaft, will oppose themovement of the arm h, and consequently the spring S will be stretched as the movement of the link continues and is completed. This yielding of the spring relieves or protects the engaged detector from undue pressure and absolutely prevents any distortion or injury of the parts, even if the adjustment of the vibrator-actuating cam O is improper.

In Fig. 5 the link is moving oppositely or in the direction of the arrow 15, and one of the detectors d has engaged .and stopped its vibrator o and the rock-sl1aftf.

The ear f movable with the rock-shaft, then holds the arm stationary, while the moving car f continues to swing the arm h, the spring S yielding and permitting the separation of the arms h k, as before.

The slot f of the actuator-arm permits the necessary lost motion, as in the construction shown the movement of the link is longitudinal only. Should the link be free to rock also as it is reciprocated, it could be joined directly to the actuator without the slot-and-pin connections herein shown. It will be understood that stoppage of the rock-shaftf by engagement of a dropped detector with the vibrator will elfect the operation of a suitable stopping mechanism (not shown) to stop the loom automatically. Thus while the link 0 mayhave a constant stroke, as herein shown, to normally rock the vibrators toward and below the detectors the protector devices interposed between the link and the rock-shaft permit stoppage of the latter, while the link continues its full stroke.

The strength of the spring is sufficient to overcome the normal resistance-of the various parts,but yields when a dropped detector is engaged by its vibrator to prevent undue pressure upon the detector.

The mechanism herein shown is simple, strong, and durable, and requires no adjustment after the loom is once set up, the spring allowing for and taking up any slight defi -ciency in adjustment or that due to wear.

' Having fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a warp stop-motion for looms, a vibrator rock-shaft having an attached ear, two yieldingly-connected arms having hubs loosely mounted on the rock-shaft, a spring to draw said arms together to engage opposite sides of the car, a sleeve fulcrumed in alinement with the shaft, provided with an arm having an ear interposed between said spring-connected arms, and means to uniformly rock the sleeve, whereby the connected arms will be rocked in unison to correspondingly move the rock-shaft, substantially as described.

2. In a warp stop-motion for looms, a vibrator rock-shaft having an attached ear, two yieldingly-oonnected rocking members fulcrumed in alinement with the longitudinal axis of said rock-shaft, to normally engage opposite sides of the ear thereof, and an actuator to normally swing said members in unison and through its ear rock the shaft, stoppage of the latter holding one member while its fellow member is moved by and in unison with the actuator, substantially as described.

3. In a loom, a series of warp-stop-motion actuating detectors movable into operative position by breakage or undue slackness of the warp-threads, a rock-shaft having an attached vibrator to engage and be held by a dropped detector, an ear on the rock-shaft, two yieldingly-connected arms loosely mounted on the said shaft, to engage opposite sides of the ear thereof, and a reciprocating actuator to normally swing said members in unison and thereby rock the shaft, stoppage of the vibrator holding one member and permitting the other member to continue its movement in unison with the actuator, substantially as described.

4. In a loom, a series of vertically-recipro- IIO son to rock the shaft, the connectingspring yielding upon stoppage of the vibrator by a dropped detector, to prevent undue pressure upon the latter, substantially as described.

In testimony whereof I have signed my name'to this specification in the presence of two subscribing Witnesses.

JAMES H. NORTHROP.

Witnesses:

HERBERT S. MANLEY, Gno. OTIS DRAPER. 

